地质论评2011，Vol.57Issue(2)：253-260,8.
内蒙古海拉尔盆地东珺铅锌银矿床地球化学特征
Geochemic Features of Dongjun Lead-Zinc Silver Deposit, Hailar Basin, Inner Mongolia
摘要
Abstract
The Dongjun deposit, located in the Hailaer Jurassic volcanic fault-depress basin, is a typical hydrothermal lead-zinc-silver deposit generated from volcanic rocks, which is characterized by significant hydrothermal alternation, apparent ore-controlling fault of metallogenic, many orebodies with small scale, etc. Volcanic rocks have high content of Alkali (K2 O＋ Na2 O= 5. 93％ ～8.26％), with the average value of Na2 O/K2O at 1.81, relatively rich in light rare earths ( LaN/YbN ＝ 16. 72 ～ 23.31 ), and with slightly Eu negative abnormality. Also, Large-ion lithophile elements (LILE) are richer than high field strength elements(HFSE), while Nb、Ta、Ti are relative drawdown, compared to LREE and LILE. The δ34S values of sulfide ores vary from +4.48‰ and +6.97％ and are typical of mantle S. In sulfide ores,the n(206Pb)/n(204Pb), n(207P1b)/ n(204Pb) and n(208Pb)/ n(204Pb) ratios vary in the ranges of 18. 3143～ 18. 4315, 15. 4934 ～ 15. 6265 and 37. 9810 ～ 38. 4236 respectively, showing that the U-Pb is richer, while Th-Ph is slightly less. Besides, in volcanic rocks, [n(87Sr) /n(86Sr)]i =0. 70506～0. 70512, [n(143Nd)/n (147Nd)]i＝0. 512521～0. 512602,εNa(t) values of 1.4～2.9. The geological and geochemical features of ore deposit indicate that the ore-forming matter is from magma system or the host rock, while the magma is mainly from the mantle rich in light rare earths, maybe mixed with a small amount of crustal materials.关键词
铅锌银矿床/地球化学特征/矿床成因/内蒙古Key words
lead-zinc-silver deposit/ geochemistry feature/ metallogeny/ Inner Mongolia引用本文复制引用
张斌,李进文,张德全,朱广仁,佘宏全,董英君,谭刚..内蒙古海拉尔盆地东珺铅锌银矿床地球化学特征[J].地质论评,2011,57(2):253-260,8.基金项目
本文为科技支撑计划(编号2006BAB01A10)、内蒙古地质勘查重大科研项目(编号内地研2004-07)和中国科学院地质与地球物理研究所矿产资源研究重点实验室资助项目的成果. （编号2006BAB01A10）
